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Ford Tractors Discussion Forum
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Diesel Compression Tester

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nashranch

10-23-2019 06:46:25




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What's an all around good compression tester? My Harbor freight one does not accumulate PSI as you're cranking




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nashranch

10-25-2019 07:48:08




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 Re: Diesel Compression Tester in reply to nashranch, 10-23-2019 06:46:25  
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Just took all that apart Jerry and there is no sign of a missing valve or threads where there shoulda been a valve



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RayJohnson

10-25-2019 07:45:23




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 Re: Diesel Compression Tester in reply to nashranch, 10-23-2019 06:46:25  
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This looks almost the same from HF for 29.99??

https://www.harborfreight.com/diesel-engine-compression-tester-20-pc-62594.html



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Destroked 450

10-25-2019 07:43:56




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 Re: Diesel Compression Tester in reply to nashranch, 10-23-2019 06:46:25  
Looked at my SpanOn gauge and the valve is at the bottom of the quick coupler.

Look inside that brass 90 to see if there's threads for a valve stem, may have got left out.

You may have to get a coupler or fitting to work with your gauge set or go back to HF even though it's been awhile, they may be able to get you the part you need.



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nashranch

10-25-2019 07:26:47




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 Re: Diesel Compression Tester in reply to nashranch, 10-23-2019 06:46:25  
I've taken all the lines and fittings apart and there is no check valve anywhere



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Bob

10-24-2019 22:36:26




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 Re: Diesel Compression Tester in reply to nashranch, 10-23-2019 06:46:25  
You are looking in the wrong place for the "check valve".

It's either in each individual port adapter, or in the quick-disconnect coupling.

I have a VERY similar imported set that I bought on Amazon several years ago, I'll try to remember to look tomorrow and see just where the check valve is.

It works very well, BTW, and, likely, so will yours when you figure out just what's going on.

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Eman85

10-24-2019 21:06:37




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 Re: Diesel Compression Tester in reply to nashranch, 10-23-2019 06:46:25  
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Also check the end of the adapter, as stated it should look like a tire valve stem core. It's a lighter pressure spring than a valve stem core.



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Destroked 450

10-23-2019 22:30:32




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 Re: Diesel Compression Tester in reply to nashranch, 10-23-2019 06:46:25  
Check the end where the quick coupler is, there should be something that looks like a tire valve stem core screwed into the hose fitting.

I'll try to look at mine to see where it's at, but my SnapOn gauge has the same style thump release yours has.



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nashranch

10-23-2019 13:07:37




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 Re: Diesel Compression Tester in reply to nashranch, 10-23-2019 06:46:25  
Yep Orygun... Home of the mighty Oregon Ducks



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Ultradog MN

10-23-2019 12:12:40




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 Re: Diesel Compression Tester in reply to nashranch, 10-23-2019 06:46:25  
Look on Craigslist in the tool section.
Also, are you familiar with Searchtempest.com?
You can use it to search all of the craigslists based on your zip code.
I have bought a couple of very nice tools that way. A good old school valve spring compressor from Denver, and a really nice pair of snap ring pliers from Idaho. I had to convince them I wasn't a scammer but I got two good tools for not much money.
You are in OR or WA aren't you?
Click the link to search within 500 miles from the Portland area.

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nashranch

10-23-2019 09:06:18




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 Re: Diesel Compression Tester in reply to nashranch, 10-23-2019 06:46:25  
I took a few pics of the check valve, you can see clear thru it





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nashranch

10-23-2019 08:59:55




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 Re: Diesel Compression Tester in reply to nashranch, 10-23-2019 06:46:25  
Yep Jerry...It's a nice looking kit. it has lots of adapters for diff. apps.
I did take apart the gage, release valve and there is no check valve in there at all..no wonder it don't accumulate PSI. Like i said i should have taken it back.
If i could find a check valve it would probably work



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Destroked 450

10-23-2019 08:53:30




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 Re: Diesel Compression Tester in reply to nashranch, 10-23-2019 06:46:25  
That's a nice looking kit, and it has the thumb release button on the side so it should have a check valve.

If the thumb release is sticking or leaking it'll cause an issue as well.

Check at the coupling and maybe take the hose off of the gauge to find the check valve, there's a small issue causing the gauge not to work properly, That gauge may not be as accurate as some of the higher priced units but it'll do the job

Next time at HF I'll look for that kit, I'd like to have it just for the adapters, I only have 2 and SnapOn charges that price for 1 or 2 adapters.

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nashranch

10-23-2019 07:51:56




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 Re: Diesel Compression Tester in reply to nashranch, 10-23-2019 06:46:25  
This is the HF kit i bought

https://www.harborfreight.com/diesel-compression-tester-set-63726.html



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nashranch

10-23-2019 07:43:13




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 Re: Diesel Compression Tester in reply to nashranch, 10-23-2019 06:46:25  
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This one don't and I shoulda taken it back but i didn't use for quite a while after i bought it. Harbor freight says 90 day return policy so i'm screwed



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Destroked 450

10-23-2019 07:25:18




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 Re: Diesel Compression Tester in reply to nashranch, 10-23-2019 06:46:25  
It should have a one way check valve like a valve stem and then a way to release the pressure once it's read.

I paid the price years ago and got one from Snap-On but there weren't many options back then.



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